Control for a multi-level inverter
AssigneeTexas Instruments Incorporated
InventorsHimanshu Chaudhary, Salil Chellappan
Life of this patent
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Abstract
A control circuit for an inverter. The control circuit includes a first pulse width modulation (PWM) module configured to produce first and second complementary PWM signals, and a second PWM module configured to produce a third and fourth complementary PWM signals. PWM switching logic is coupled to the first and second PWM modules and is adapted to be coupled to a switch network. The switch network includes first, second, third, and fourth switches coupled in series between a first voltage terminal and a second voltage terminal. The PWM switching logic is configured to produce control signals for each of the first, second, third, and fourth switches in response to the first and second complementary PWM signals and to the third and fourth complementary PWM signals.
Claims20
A circuit, comprising:
- a first pulse width modulation (PWM) module configured to produce a first pair of complementary PWM signals including a first signal and a second signal;
- a second PWM module configured to produce a second pair of complementary PWM signals including a third signal and a fourth signal;
- a logic circuit coupled to the first and second PWM modules and configured to produce a fifth signal and a sixth signal, wherein a transition of the fifth signal is delayed with respect to a transition of the first signal, and a transition of the sixth signal is delayed with respect to a transition of the second signal, based on the third signal;
- and
- PWM switching logic coupled to the logic circuit and a switch network, wherein the switch network includes first, second, third, and fourth switches coupled in series between a first voltage terminal and a second voltage terminal, and wherein the PWM switching logic is configured to produce respective control signals for the first, second, third, and fourth switches based on the third, fourth, fifth, and sixth signals.
A system comprising:
- a switch network including first, second, third, and fourth switches coupled in series between a first voltage terminal and a second voltage terminal;
- a first pulse width modulation (PWM) module configured to produce first and second complementary PWM signals;
- a second PWM module configured to produce a third and fourth complementary PWM signals;
- PWM switching logic coupled to the first and second PWM modules and the switch network, the PWM switching logic configured to produce respective control signals for the first, second, third, and fourth switches in response to the first and second complementary PWM signals and the third and fourth complementary PWM signals;
- and
- an extended Ton protection circuit coupled between the first PWM module and the PWM switching logic, the extended Ton protection circuit having an input configured to receive the third complementary PWM signal, and the extended Ton protection circuit configured to delay turning off the second switch after the first switch is turned off, and delay turning off the third switch after the fourth switch is turned off.
A control circuit for an inverter, comprising:
- a first pulse width modulation (PWM) module configured to produce first and second complementary PWM signals;
- a second PWM module configured to produce third and fourth complementary PWM signals;
- PWM switching logic coupled to the first and second PWM modules and a switch network, the switch network including first, second, third, and fourth switches coupled in series between a first voltage terminal and a second voltage terminal, and the PWM switching logic configured to produce respective control signals for ach of the first, second, third, and fourth switches in response to the first and second complementary PWM signals and the third and fourth complementary PWM signals;
- and
- an extended Ton protection circuit coupled between the first PWM module and the PWM switching logic, the extended Ton protection circuit having an input configured to receive the third complementary PWM signal, and the extended Ton protection circuit configured to delay turning off the second switch after the first switch is turned off, and delay turning off the third switch after the fourth switch is turned off.
Dependencies are inferred from the claim text.